This is the Cycloid Mini: a hand cranked epicycloid drawing machine that uses rational and prime gears to draw gorgeous geometric shapes. It comes assembled, so you just have to put a pen in the penholder and crank the handle. This machine creates 4 inch diameter drawings.
More gadgets like this: here
The Cycloid Mini can produce gorgeous 5 and 3 node drawings. You can find out more about it here.
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